42 results about "Lanthanum hexaboride" patented technology

The invention discloses a high-transparency PVB intermediate film and a production process and application thereof, and relates to the technical field of PVB intermediate films, the high-transparency PVB intermediate film comprises the following raw materials by weight: 100 parts of PVB resin, 20-30 parts of a composite plasticizer, 0.5-0.9 part of an LDH-based composite antioxidant, 0.5-1 part of an ultraviolet light absorber, 0.1-1.5 parts of nano lanthanum hexaboride, 0.1-1.5 parts of porous hollow nano copper sulphide, and 0.1-2 parts of nano TiO2 / SiO2 core-shell particles. The PVB intermediate film provided by the invention is relatively high in light transmittance, low in haze value, and excellent in oxidation resistance, weather resistance and mechanical strength.

The invention relates to the technical field of metal material surface strengthening and modification, in particular to a preparation method and process of a titanium alloy laser cladding cobalt-based wear-resistant coating. The invention provides a titanium alloy surface laser cladding cobalt-based wear-resistant coating which takes titanium or a titanium alloy as a base material, comprises the following components in percentage by weight: 40-50% of cobalt (Co), 30-40% of tungsten carbide (WC), 10-15% of chromium (Cr), 1-5% of lanthanum hexaboride (LaB6), 2-5% of silicon (Si) and 0.5-3% of calcium fluoride (CaF2), and has the beneficial effects of improving wear resistance, high-temperature stability, corrosion resistance, high hardness, high bonding strength, difficulty in cracking and the like.

To provide an electron-generating material and electron-generating member, which can reduce a friction coefficient.SOLUTION: An electron-generating material capable of reducing a friction coefficient is provided, the material comprising powder of a natural mineral containing a radioactive substance and powder of an electron-generating material that generates electrons when subjected to alpha rays emitted from the natural mineral, where the powder of the electron-generating material comprises titanium dioxide powder, lanthanum hexaboride, and silicon metal.SELECTED DRAWING: None

This invention relates to the field of welding electrodes for duplex stainless steel, specifically to a welding electrode for duplex stainless steel and its preparation method. When residual stress at the weld seam of 2209 duplex stainless steel is eliminated through high-temperature heat treatment, the mechanical properties and corrosion resistance of the weld seam significantly decrease. To address the above technical problem, this invention provides a welding electrode for duplex stainless steel that effectively slows down the phase transformation rate during high-temperature heat treatment, avoids excessive austenite formation, and maintains the balance of the duplex structure. The electrode coating composition specifically includes lanthanum hexaboride and Ti-6Al-4V alloy, which have grain-refining effects and simultaneously inhibit the precipitation of harmful intermetallic phases. This effectively suppresses the precipitation of harmful phases such as the σ phase during weld heat treatment, ensures the solid solubility of chromium and molybdenum, and allows the weld seam to retain excellent comprehensive properties after high-temperature treatment.

The invention discloses a preparation method of a lanthanum hexaboride / graphene hybrid reinforced Ti2AlNb-based composite material for high-temperature application, and relates to a preparation method of a Ti2AlNb-based composite material. The problems that an existing Ti2AlNb composite material is low in Ti2AlNb heat resistance, poor in plasticity and the like under the high-temperature condition are solved. According to the non-continuous reinforced Ti2AlNb-based composite material and the preparation method thereof, the non-continuous reinforced Ti2AlNb-based composite material is prepared by introducing an in-situ authigenic boride reinforcement body, meanwhile, dispersion strengthening is achieved in the Ti2AlNb composite material through cooperation of high strength of graphene and in-situ authigenic boride (Ti, Nb) B, when the graphene and the (Ti, Nb) B are jointly reinforced, stress is dispersed by the graphene, dislocation movement is hindered by the (Ti, Nb) B, the strength is remarkably improved through the synergistic effect, and the non-continuous reinforced Ti2AlNb-based composite material is obtained. Therefore, by adding the graphene, the interface bonding quality is improved, the stress concentration is reduced, the plastic deformation capacity is improved, the ductility is remarkably improved, and the strength and plasticity of the Ti2AlNb composite material at the high temperature are improved.

The invention provides a lanthanum hexaboride emitter adapted to a hollow cathode erosion process, the lanthanum hexaboride emitter is made of lanthanum hexaboride, the emitter is integrally in an axially symmetrical star-shaped cylinder structure, the cross section of the emitter is in a regular star shape containing n uniformly distributed star angles and n star grooves, the side edges of the adjacent star angles form a star edge included angle theta, and the thickness of the emitter is e. The inner surface degradation is divided into two stages by the H point (namely the point where the straight line C-D section disappears), and by designing parameters of n and theta, the emitter can realize constant-surface, increased-surface or decreased-surface degradation before the emitter is degraded to the H point. The emitter is designed to be reduced in surface degradation, so that the emitter can adapt to the actual working condition that the downstream degradation rate is higher in the working process of the hollow cathode, and the area of the electron emission surface of the hollow cathode is basically kept consistent in the whole life cycle. In addition, compared with a traditional emitter, the star-shaped emitter is smaller in outer diameter under the same emission area and thickness, the design of a small-size and low-power-consumption hollow cathode is facilitated, and the star-shaped emitter is suitable for a long-service-life aerospace electric propulsion task.

The application discloses a rare earth heat-insulating automobile window film and relates to the technical field of films.The prepared rare earth heat-insulating automobile window film is composed of a hardening layer, a magnetron sputtering film layer, a base material layer, a mounting adhesive layer and a release film layer in sequence and is integrated; the hardening layer is obtained by coating modified polyurethane on the magnetron sputtering film layer and solidifying; the modified polyurethane is obtained by mixing polyurethane prepolymer, modified lanthanum hexaboride and phosphorus-containing silane crosslinking agent; and the prepared rare earth heat-insulating automobile window film has good heat insulation, weather resistance and flame retardance.

The invention aims to solve the problem that the copper SLM printing machinability is poor, so that the performance of the copper SLM is seriously influenced. The preparation method comprises the following steps that S1, material preparation is conducted, specifically, high-purity copper powder and high-purity lanthanum hexaboride powder are mixed, and evenly-mixed powder is obtained; s2, the mixed powder is subjected to additive manufacturing forming through the selective laser melting technology; and S3, linear cutting is conducted, specifically, linear cutting is conducted on the printed lanthanum hexaboride / copper composite material workpiece in a linear cutting mode, and the lanthanum hexaboride / copper composite material is obtained. The preparation complexity and cost of the lanthanum hexaboride / copper composite material are greatly reduced, the prepared lanthanum hexaboride / copper composite material is good in compounding effect, high in strength and toughness and high in conductivity, and new possibility is developed for wide industrial application.

The application discloses polycrystalline lanthanum hexaboride and a preparation method and application thereof, and belongs to the technical field of lanthanum hexaboride preparation, and the preparation method comprises the following steps: ball milling mixed powders of lanthanum hexaboride powders and spherical nickel powders in a protective gas to prepare ball-milled powders; screening the ball-milled powders through an ultrasonic vibration sieve classifier, and collecting mixed powders with a particle size of 1-2 microns; placing the screened mixed powders in a mold, and then performing gradient hot-pressing sintering under vacuum conditions; and cooling after sintering to obtain the polycrystalline lanthanum hexaboride. The relative density of the material is as high as 99.42%, the material has the advantages of high density and strong thermal electron emission performance, the production cost of the method is low, the process difficulty is low, and the method can effectively solve the problems existing in the preparation of polycrystalline lanthanum hexaboride by using the existing sintering method.

The invention discloses an oxide-doped LaB6 polycrystalline material and a preparation method and application thereof.The preparation method comprises the steps that lanthanum hexaboride and metal oxide are mixed, ball-milled to be uniform and dried to obtain first powder, the metal oxide is an oxide of M, and M is Al, Zr and Ti; the first powder is placed in a mold, the first powder is located in the center of the mold and has the same apparent density, in the inert gas atmosphere, the pressure is increased from the pressure P1 to the pressure P2, heat preservation is carried out for 0.5-3 h at the pressure P2 and the temperature of 1400-2000 DEG C, hot pressing sintering is carried out, cooling is carried out, meanwhile, pressure preservation is carried out for 0-3 h at the pressure P2, the LaB6 polycrystalline material doped with the oxide is obtained, the P1 ranges from 5 MPa to 9 MPa, and the P2 ranges from 20 MPa to 60 MPa. By adding the oxide phase, the sintering temperature of the pure LaB6 ceramic is reduced from 1975 DEG C to 1800 DEG C or below, the conductivity of the LaB6 ceramic is not deteriorated after doping, and the bending strength is effectively improved.

The invention discloses a multiphase ceramic material connector for a fuel cell, the multiphase ceramic material connector is divided into an upper surface layer, a middle matrix layer and a lower surface layer in the height direction, and the upper surface layer and the lower surface layer are both formed by compounding lanthanum hexaboride and hexagonal boron nitride. And the middle matrix layer is formed by compounding titanium diboride and hexagonal boron nitride. According to the invention, the composite ceramic material connector has excellent conductivity, can realize full-temperature-range conductivity from room temperature to high temperature, and has better mechanical properties and machinability.

The application discloses a shielding piece made of a tungsten-based alloy material, a preparation method and application, the tungsten-based alloy comprises a tungsten base and lanthanum hexaboride dispersed in the tungsten base, and the content of boron in the tungsten-based alloy is 0.01wt%-0.5wt%. The tungsten-based alloy in the application introduces lanthanum hexaboride, which is beneficial to the refinement of tungsten grains in the tungsten-based alloy, enhances the toughness of the tungsten-based alloy, reduces the ductile-brittle transition temperature, and improves the absorption capacity of the tungsten-based alloy to neutron irradiation; meanwhile, the introduction of the lanthanum hexaboride does not reduce the heat conduction performance of the tungsten base, but helps to improve the heat conduction performance of the material, which is all beneficial to the improvement of the service life of the shielding piece.

The invention relates to the technical field of welding materials, in particular to a preparation method of a flux-cored wire, which comprises the following specific steps of: weighing a flux core according to a weight part ratio, putting the flux core into a mixer, and uniformly stirring; the flux core is mixed and wrapped in a steel belt, and diameter reducing, wiredrawing and take-up operation are carried out; the preparation method of the flux core comprises the steps that cobalt powder, yttrium oxide powder, lanthanum hexaboride powder and iron powder are weighed by weight and then put into a pelletizer to be evenly mixed and pelletized, and the inner shell is obtained; the preparation method comprises the following steps: weighing carbon powder, magnesium powder, manganese powder, silicon powder, aluminum-coated nickel powder and iron powder in parts by weight, putting into a stirrer, and uniformly mixing to obtain a mixed material; and the mixed material and the inner shell are put into a pelletizer to be pelletized, and the flux core is obtained. According to the welding wire preparation method, the manufacturing process route is simple and easy to operate, the production efficiency of the welding wire is high, the surface of the welding wire is clean, and therefore when the welding wire is used, wire feeding is smooth, and splashing is small during welding.

The invention discloses a tungsten-copper-based alloy material as well as a preparation method and application thereof, and relates to the technical field of alloy materials. Lanthanum hexaboride and / or yttrium hexaboride are / is introduced into the tungsten copper material to serve as an additive, and irradiation damage of the tungsten copper material is avoided by means of the shielding capacity of boron to neutron irradiation; and meanwhile, lanthanum hexaboride or yttrium hexaboride is stable in property and has a particle reinforcing effect, so that the mechanical property of the tungsten copper material is further improved.

The present application relates to the technical field of composite materials, in particular to a heat and sound insulation PVB interlayer and a preparation method thereof.The present application overcomes the problem of insufficient heat insulation and aging resistance of the PVB interlayer.The PVB interlayer is prepared by mixing the PVB resin pre-plasticized with the silane coupling agent modified reinforcing nanocellulose, and then adding the plasticizer, lanthanum hexaboride loaded with molybdenum trioxide, composite light stabilizer, modified cerium oxide and other additives in sequence, and through casting and hot pressing treatment.The modified lanthanum hexaboride enhances the infrared shielding, the composite light stabilizer and the modified cerium oxide synergistically improve the aging resistance, and the components are synergized through the process to comprehensively improve the heat insulation, sound insulation and aging resistance of the PVB interlayer, which is suitable for the field of high-strength building glass.

The application discloses a barium tungsten lanthanum hexaboride composite hollow cathode, which comprises a cathode tube, a gas inlet is arranged at a first end of the cathode tube, a cathode top is arranged at a second end of the cathode tube, and a cathode top through hole is arranged in the cathode top; a touch electrode is arranged outside the cathode tube, an end of the touch electrode is provided with a touch electrode top, a touch electrode through hole is arranged in the touch electrode top, and the touch electrode is coaxial with the cathode tube; an emitter comprises a first emitter and a second emitter, the first emitter and the second emitter are sequentially arranged on an inner wall of the second end of the cathode tube in a direction from the gas inlet to the cathode top; a heater is arranged around an outer wall of the cathode tube; wherein the first emitter is a barium tungsten emitter, the second emitter is a lanthanum hexaboride emitter, and the lanthanum hexaboride emitter is heated by heat generated by self-sustaining work of the barium tungsten emitter, so that the starting power consumption is greatly reduced.

The X-ray generating device with switchable focus of the present invention includes a high-voltage power supply and an X-ray tube. The X-ray tube is disposed at one end of the high-voltage power supply and includes a cathode assembly, an anode assembly, an electron beam focusing assembly, a housing assembly, and a vacuum assembly. The cathode assembly includes a replaceable cathode unit, which is a lanthanum hexaboride cathode or a zirconium oxide tungsten cathode. By setting the replaceable cathode unit to a lanthanum hexaboride cathode or a zirconium oxide tungsten cathode, free switching between microfocus mode and nanofocus mode is achieved, enabling high resolution and high power output on the same device, and simultaneously meeting the high-precision inspection requirements of chip packaging and the high-power inspection requirements of circuit boards, batteries, etc.

To provide a method of manufacturing an electron-generating material capable of reducing the friction coefficient, and a method of manufacturing an electron-generating member.SOLUTION: A method of manufacturing an electron-generating material capable of reducing the friction coefficient is provided, the method involving forming a fluidic electron-generating material by mixing and agitating powder of a natural mineral containing a radioactive substance, powder of an electron-generating substance that generates electrons when subjected to alpha rays emitted from the natural mineral, and a dry fluid binder. The powder of the electron-generating substance comprises titanium dioxide powder and at least one type of powder selected from powder of lanthanum hexaboride, silicon metal, and molybdenum disulfide.SELECTED DRAWING: None

The application provides a lanthanum hexaboride emitter adapted to the erosion process of a hollow cathode, which is made of lanthanum hexaboride and has an axial symmetric star-shaped column structure, and the cross section of the emitter is a regular star shape with n uniformly distributed star corners and n star grooves, the side edges of adjacent star corners form a star edge included angle θ, and the thickness of the emitter is e. A point H (i.e. a point where a straight line C-D segment disappears) divides the inner surface degradation into two stages, by designing the parameters n and θ, the emitter can realize constant surface, increasing surface or decreasing surface degradation before degrading to the point H. The design of the emitter as decreasing surface degradation can adapt to the actual working condition that the downstream degradation rate is faster in the working process of the hollow cathode, so that the electron emission surface area of the hollow cathode is basically maintained consistent in the whole life cycle. In addition, compared with the traditional emitter, the star-shaped emitter has a smaller outer diameter under the same emission area and thickness, which is beneficial to the design of the small size and low power consumption hollow cathode, and is suitable for long life space electric propulsion tasks.

The invention discloses a heat-insulating high-transmittance polyester film and application thereof. The heat-insulating high-transmittance polyester film comprises a polyester base layer and a barrier layer arranged on the surface of the polyester base layer. The invention also provides a preparation method, which comprises the following steps: firstly preparing a biaxially oriented polyester film as the polyester base layer, and then coating the polyester base layer subjected to corona treatment with a barrier liquid composed of a cycloolefin copolymer and lanthanum hexaboride nanoparticles by adopting a blade coating method so as to form the barrier layer on the polyester base layer. And then preparing the heat-insulating high-transmittance polyester film through high-temperature mold pressing. Compared with the prior art, the polyester film prepared by the preparation method disclosed by the invention has the characteristics of high transparency and excellent heat insulation effect, and the problem of ultraviolet aging resistance is further improved, so that the polyester film with excellent ultraviolet resistance, tensile property and barrier property is obtained.

The application relates to the technical field of space electric propulsion, in particular to a hollow cathode and a processing method thereof, which comprises a composite substrate; the composite substrate is provided with a cathode salt; the preparation material of the composite substrate comprises tungsten carbide and lanthanum hexaboride; the application discloses a hollow cathode; the tungsten carbide and the lanthanum hexaboride are mixed and used, so that the hollow cathode disclosed by the application can not only ensure a low working temperature, but also ensure the current density emitted by the hollow cathode.

The invention belongs to the technical field of copper-based composite materials, and particularly relates to a high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire with a nano structure and a preparation method thereof. The preparation method comprises the following steps: mixing nanoscale lanthanum hexaboride powder, nanoscale rare earth oxide powder and copper powder to obtain mixed powder, and carrying out plasma-assisted high-energy ball milling on the mixed powder to obtain composite powder; the composite powder is subjected to cold pressing forming, and a green body is obtained; sintering the green body in a reducing atmosphere to obtain a sintered blank; carrying out hot extrusion on the sintered blank to obtain a blank subjected to hot extrusion; continuously extruding the blank subjected to hot extrusion to obtain a wire blank; and the wire blank is sequentially subjected to cold drawing and annealing treatment, and the high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire is obtained. The high-strength, high-conductivity and high-temperature-resistant copper-based composite rod wire provided by the invention has ultrahigh strength, high electric conductivity and heat conductivity and excellent high-temperature stability.

The invention provides a polycarbonate material as well as a preparation method and application thereof. The polycarbonate material is prepared from the following components in parts by weight: 100 parts of polycarbonate, 0.01 to 0.1 part of neutral filtering aid, 0.2 to 1 part of surface modified ITO (Indium Tin Oxide) nanowire, 0.1 to 0.6 part of lanthanum hexaboride and 0.05 to 0.3 part of SiO2 coated ZnO, and the neutral light filtering auxiliary agent comprises a combination of CuCr2O4 and Cr2O3. According to the polycarbonate material provided by the invention, through the specific neutral filtering auxiliary agent, it is ensured that after light penetrates through the material, color distortion of a light source is not caused by different transmittance of different wavelengths; by compounding the surface modified ITO nanowire, lanthanum hexaboride and SiO2 coated ZnO, the laser cutting feasibility of the polycarbonate material is improved, and the thickness of a carbonized layer after laser cutting is effectively reduced, so that the size accuracy of a part after laser cutting is ensured.

The invention discloses a rare earth compound composite reinforced tungsten filament and a preparation method thereof, the rare earth compound composite reinforced tungsten filament is provided with a tungsten matrix, nanoscale lanthanum oxide and lanthanum boride are dispersed and distributed in the tungsten matrix, and boron elements are segregated at the grain boundary of the tungsten matrix; the tungsten-LaB6 composite material is prepared from 99.2-99.4 wt% of tungsten powder and 0.6-0.8 wt% of LaB6 powder, the average particle size of the tungsten powder is 1.5-2.5 m, and the average particle size of the LaB6 powder is smaller than 500 nm. According to the invention, lanthanum hexaboride (LaB6) is introduced as a single precursor, in-situ chemical reaction is realized in the hydrogen sintering process, and a dual reinforcement mechanism of nanoscale lanthanum oxide particle generation and boron segregation is realized, so that not only is the pain point in the prior art solved, but also a high-performance material is provided for the high-requirement field; wide industrial application prospects and commercial values are realized.

The invention relates to the technical field of metal materials, and particularly discloses a temperature-controlled step-by-step smelting preparation method of a hydrogen-purified vanadium-platinum alloy, and the hydrogen-purified vanadium-platinum alloy is prepared from the following raw materials in parts by weight: 88-92 parts of a vanadium raw material; 8-12 parts of a platinum raw material; 0.03 to 0.06 part of a primary gas phase activator; and 0.15 to 0.25 part of a secondary composite trapping agent. The first-stage gas-phase activating agent is prepared from nano carbon black and lanthanum hexaboride, and the weight ratio of the nano carbon black to the lanthanum hexaboride is (50: 1)-(60: 1). The secondary composite trapping agent is prefabricated quaternary alloy powder and comprises zirconium, yttrium, boron and silicon, and the weight ratio of the zirconium to the yttrium to the boron to the silicon is 40: 40: 5: 15. According to the method, the first-stage gas phase activator and the second-stage composite trapping agent are adopted for synergistic purification, interstitial impurities can be effectively removed, generation of a brittle hard phase is inhibited, the high-plasticity vanadium-platinum alloy is obtained, and the problems that a traditional material is large in brittleness and difficult to carry out cold rolling machining due to oxygen and nitrogen pollution are solved.

The application provides a rare earth-based temperature-sensitive organic supermolecular gel ice-melting accelerating coating material and a preparation method. The material uses a single-modified columnar arene, has better flexibility than a multi-modified compound, is convenient for producing a structure transition, and a compound modified by four carbon chains has a higher yield than a compound modified by a longer carbon chain, and can generate a substitution reaction faster than the longer carbon chain at normal temperature and pressure. The one-step synthesis method is simple and easy to operate, and connects lanthanum hexaboride to a polymer chain in a chemical bond mode, compensates for the low strength and poor toughness of inorganic nanoparticles and the weak weather resistance and stability of organic matters, and uses a cyan compound which has a strong cavity bonding force with the columnar arene, so that the lanthanum hexaboride is not easy to fall off with a phase transition during ice removal, and thus loses the photo-thermal effect.

This invention provides a rare-earth composite thermosensitive supramolecular gel de-icing material for railways and its preparation method. This gel de-icing material utilizes the photothermal effect of rare-earth nano-borides, such as lanthanum hexaboride, to accelerate ice melting. It also utilizes a thermosensitive supramolecular polymer, which undergoes a gel-sol transition at a specific temperature. In cold weather, its temperature is far below the transition temperature, so it remains in a gel state. However, as the rare-earth nano-borides continuously absorb heat and gradually reach the transition temperature, it becomes a sol state and detaches with the ice layer, thereby solving the railway anti-icing problem.

The utility model relates to the field of industrial electron accelerators, in particular to a heat insulation device for an electron gun of an industrial electron accelerator. The cable comprises a base body and a shielding layer assembly. The shielding layer assembly comprises a first shielding layer, a second shielding layer and a third shielding layer which are sequentially distributed on the base body from inside to outside, the inner side of the first shielding layer is provided with a filament containing space, the top of the first shielding layer is provided with a first opening, the top of the second shielding layer is provided with a second opening, and the top of the third shielding layer is provided with a third opening. And the first opening, the second opening and the third opening are distributed in an aligned manner. According to the utility model, rapid diffusion and attenuation of temperature can be prevented, high-temperature stability around the lanthanum hexaboride filament at the inner side can be maintained, and energy efficiency of the whole accelerator can be ensured.

The invention provides a high-temperature self-reflection composite sleeve. The high-temperature self-reflection composite sleeve comprises a neck bush, a high-temperature-resistant heat insulation coating and a high-reflection layer, wherein the outer surface of the neck bush is coated with the high-temperature-resistant heat insulation coating, and the high-reflection layer is deposited on the outer surface of the high-temperature-resistant The high-temperature-resistant heat-insulating coating is prepared from the following components in parts by weight: 40 to 60 parts of silica sol-polyimide hybrid resin, 5 to 15 parts of lanthanum hexaboride, 10 to 20 parts of aluminum hydroxide, 10 to 20 parts of silicon dioxide aerogel microspheres, 5 to 12 parts of ammonium polyphosphate, 3 to 8 parts of zinc oxide and 80 to 150 parts of solvent. The reflection layer, the flame-retardant layer and the heat insulation layer are formed through structural optimization of the sleeve, the problems that a traditional sleeve is prone to being burnt out at extremely high temperature, large in weight, much in smoke and the like are solved, the sleeve is particularly suitable for high-standard heat protection requirements in the fields of spaceflight, military industry, nuclear power and the like, and remarkable technical breakthrough and market competitiveness are achieved.